Companies in the Standard & Poor’s 500 index are poised to boost net income by 19 percent in 2011, including a 13 percent gain in the second quarter, according to analyst estimates compiled by Bloomberg. The gain will push profits back in line with their average increase of 6.9 percent over the past 51 years, data compiled by Brockhouse & Cooper Inc. and Bloomberg show. At the same time, the index is trading at 13.5 times projected 2011 earnings, 7.8 percent less than the average since the start of 2006. The gap between earnings and shares is bolstering bulls who say equities will keep rallying as prices catch up to profits.